class Mydict(dict):

    def __init__(self,**kw):
        super().__init__(**kw)

    def __getattr__(self,key):
        try:
            return self[key]
        except KeyError:
            raise AttributeError(r"'Mydict' object has no attribute '%s'"%key)
    def __setattr__(self,key,value):
        self[key]=value

        
